Receiving system



Sept. 6, 1932. c. YOUNG 7 1,876,159

RECEIVING SYSTEM Filed July 20, 1928 2 Sheets-Sheet l TD AUDIO AMP. 0n PHONES j- I'lllllli? I INVENTOR.

Qw C mung ORNEY Sept. 6, 1932. 1 YOUNG 1,876,159

RECEIVING SYSTEM Filed July 20, 1928 2 Sheets+Sheet 2 INVENTOR.

53w BY y Patented Sept. 6, 1932 UNITED STATES PATENT OFFICE LEO C. YOUNG, OF WASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOB, BY MESNE AS- SIGNMENTS, TQWIRED RADIO, INQ, OF NEW YORK, N. Y., A CORPORATION OF DELA- WARE RECEIVING SYSTEM Application filed July 20,

My invention relates to receiving systems in general and more specifically to circuit arrangements.

An object of my invention is to provide a receiving system whereby a plurality of source-s of signaling energy may be received simultaneously.

Another object of my invention is to provide a receiving system whereby a plurality of signals may be received and means for causing the resultant signal audibility to be independent of fading and disturbing currents.

Other and further objects of my invention will appear from the specification to follow and by referring to the accompanying drawings in which:

Figure 1 is a schematic circuit diagram of the receiving system of my invention; Fig. 2 is a schematic circuit diagram showing modifications of the receiving system of my invention; and Fig. 3 is a schematic circuit diagram showing further modifications of the receiving system of my invention. 7

It has long been known that fading of signals prevents reliable communication. Further hindrances include atmospheric irregu larities and interference from transmitting stations other than the one desired to be received. An advantage of my receiving system, when employed with transmitting systems similar to those described in my U. S. Patent 1,766,050 issued June 24, 1930, is that with the system I employ fading of signal strength and interference from other stations is greatly reduced.

Fig. 1 of the drawings illustrates a schematic diagram of a circuit arrangement wherein thermionic vacuum tubes 41, 42 and 43 respectively each having grid, filament and plate electrodes are connected in regenerative circuit arrangements. The grid circuits of the respective thermionic vacuum'tubes include capacity 58 and inductance 44, capacity 59 and inductance 45, capacity and inductance 46. The oscillation constants for the grid circuits of vacuum tubes 41, 42 and 43 may correspond respectively to the fundamental frequency and two harmonic frequencies of the transmitted signal. Capacities 55,

1923. Serial No. 294,287.

56 and 57 respectively may likewise be of the proper valueto offer a low impedance to the fundamental frequency or to either ofv the two harmonic frequencies of the transmitted signal. Antenna 47 and ground 47a constitute means for receiving the transmitted radio frequency energy, the frequency characteristics of which may be aperiodic. The audio frequency plate circuits 52, 49, and 50 of thermionic vacuum tubes 41, 42 and 43, respectively, include a common source of potential 53 for energizing the respective plate electrodes. A common output circuit 51, associated with the plate circuits 52, 49 and 50, provides means for reproducing or further amplifying the audio frequency energy. By means of switches 48 either of the circuits or any combination thereof may be employed thereby obtaining in the output circuit 51 the maximum'ratio of desired response to undesired response.

In Fig. 2 of the accompanying drawings is shown a circuit arrangement similar to that i of Fig. 1. Antennae 7, 8 and 9, respectively, have frequency characteristics corresponding approximately to the frequencies of the transmitted signals. Capacities 21, 22 and 23 respectively transfer the incoming signalling energy to the respective grid circuits 4, 5 and 6 of thermionic vacuum tubesl, 2 and 3. Separate sources of energy 10, 11 and 12 are em ployed for energizing the filament circuits of thermionic vacuum tubes 1, 2 and 3 respectively. A sourceof potential 18 is employed for supplying the plate circuits of thermionic vacuum tubes 1, 2 and 3. Radio frequency plate circuits 24-27, 2528 and 2629 respectively, provide regeneration of the signal energy in the circuits of vacuum tubes 1, 2 and 3 respectively. The audio frequency ployed instead of the three-phase transformer. Either a delta or Y connection could be employed for the secondary or output winding 19 in case individual audio frequency amplifiers were desired.

A. radio frequency amplifier in combination with a detector and audio frequency amplifier may be employed in a circuit arrangement similar to the schematic circuit diagram of Fig; 3. In this circuit arrangement the three incoming sigi-ials may be received by a common antenna system 7 and ground system 28, or three separate antenna and ground systems could be employed as shown in Fi 2. In case only one antenna and ground system is employed, capacities 21, 22 and 17 respectively could be of a proper value for selective transfer of radio fre quency energy to the input circuits 4, and 29. Thermionic vacuum tubes 1, 2 and are illustrated as three element tubes, however, it is obvious that four element tubes could be employed in their stead. The input circuit 4 of thermionic vacuum tube 1 is tuned to the fundamental frequency of the transmitted signal. The input circuit 5 of thermionic vacuum tube 2 is tuned to a harmonic frequency of the transmitted signal. The input circuit 29 of thermionic vacuum tube 30 is tuned to a harmonic frequency of the transmitted signal of fundamental frequency and to a frequency value differing from that of amplifier 2 and input circuit 5. lhe output circuits 14, 15 and 31 of radio frequency amplifier tubes 1, 2 and 30, respectively, have frequency values corresponding to the fundamental frequency and two difierent harmonic frequencies of the transmitted signalling en ergy. Thermionic vacuum tubes 3, 6 and are operated at the proper grid bias to function as rectifiers of the high frequency enerthe input circuits 13 16 and 34- of thermionic vacuum tubes 3, 6 and 35' having frequency characteristics corresponding, respectively, to the fundamental frequency and two different harmonic frequencies of the trans mitted signalling energy. Audio frequency transformer having primary windings common with the output circuits 9, 25 and 36 of thermionic vacuum tubes 3, 6 and 35 respectively, provide means for transferring the rectified high frequency signalling energy to acommon audio frequency amplifying circuit. Individual amplifier circuits could. be employed using a delta or Y connected input circuit similar to input circuits of the radio frequency amplifiers 1, 2 and 30. A thermionic vacuum tube 8 is employed in an amplifier circuit arrangement, including input circuit 24 and output circuit 26, a. source of potential ll for energizing the filament circuit and source of plate potential 39'. An external output circuit 27 and re producing means 20 are associated with the output circuit 26 of audio frequency amplifier 8.

In my U. S. Patent 1,766,050 a system is disclosed in which three individual harmonically related frequencies are transmitted in a predetermined phase relation. I These frequencies may correspond to a fundamental frequency and two different harmonic frequencies. The harmonic relation between the three frequencies, however, may be any other and need not be the fundamental and harmonics referred to. The number of individual frequencies transmitted is not limited. Four or ten could be employed without undue complication of the circuit arrangements. The different frequencies transmitted are caused to be transmitted at slightly different intervals of time in succession and having a. phase relation depending upon the frequency of the multiphase exciting energy at the transmitting station.

In the receiving system of my invention the individual frequencies are received by a common antenna-ground system or by indi vidual antennae and ground connections. The signalling energy of different frequency values is transferred to individual input circuits having frequency characteristics corresponding to the frequencies of the transmitted frequencies. The multiphase relation of the different sources of received energy corresponds to the multi-phase relation of the transmitted sources of high frequency signalling energy. The input circuit may be a radio frequency transformer with either delta or Y connected primaries and secondaries. Three individual transformers may be employed and connected in the Y arrangement or individually excited by individual antenna-ground or antenna-counterpoise systems. The input circuits may be aperiodic and amplify all of the frequencies and need not necessarily be multi-phase transformers as illustrated in the accompanying drawings. The secondaries of the transformers may be connected in a Y circuit arrangement and excite individual thermionic vacuum tubes, one thermionic tube having a plurality of grid electrodes or an aperiodically tuned secondary winding connected to a single thermionic vacuum tube. It is obvious that any number of thermionic vacuum tubes may be employed, depending on the number of individual frequencies transmitted and the preferred circuit arrangement whether individual amplifiers are desired for each transmitted frequency or acommon amplifier having aperiodic frequency characteristics. It is likewise obvious that individual audio frequency amplifiers may be employed associated with individual reproducers. Individual sources of energy are shown for energizing the respective filament circuits and for supplying a positive potential to the respective plate circuits. It is obvious that a common source i of said received sources of high of potential may be employed for all of the individual circuits and connected in a Y circuit arrangement with the respective loadcircuits, a delta circuit arrangement or a com-. bination of the two. I realize that many modifications of the embodiments of my invention are possible without departing from the spirit of my invention and it is not intended that my invention be limited to the foregoing specification or to the accompanying drawings but only as defined in the appended claims.

What Iclaim as. new and desire to secure by Letters Patent of the United States is as follows: V

1. In a radio receiving system the combination of a plurality of .thermionic tubes having a plurality of input circuits, said input circuits having different harmonically related frequency characteristics corresponding to a plurality of transmitted signals, said thermionic, tubes having a common output circuit, and means associated with said output circuit for reproducing the received signalling energy.

2. In a high frequency radio receiving system the combination of a plurality of antenna systems, a transformer havingla plurality of branch windings, said antenna systems connected to the respective branch windings of said transformer, said windings connected in a delta arrangement and each of said windings having frequency characteristics differing from the other.

3. In a radio receiving system the combination of a plurality of received sources of high frequency multi-phase signalling energy, said sources of different frequencies harmonically related, a plurality of input circuits having frequency characteristics corresponding to said different frequencies respectively and output circuits connected in a delta arrangement and having frequency characteristics corresponding to said different frequencies of said received sources of signalling energyrespectively.

4. In a system for the reception of high frequency signalling energy the combination of a plurality of individual received sources of high frequency energy, the frequencies of said sources harmonically related and a plurality of input circuits connected in delta arrangement having frequency characteristics corresponding to the respective frequency values frequency signalling energy.

5. In a system for the reception of high frequency signalling energy, the combination of a plurality of individual received sources of high frequency energy, each of said sources having a frequency value differing from and harmonically related to the other, a plurality of input circuits having frequency characteristics corresponding to the received sources of high frequency signalling energy respectively, andoutput circuits connected in delta for the combination of sald received sources of high frequency energy.

6. In a system for the reception of high frequency signalling energy the combination of a plurality of received sources of high fre'-' quency signalling energy, said received sources having unlike and harmonically related frequency values, a plurality of thermionic tubes having a plurality of input circuits associated with said sources respectively tubes having input circuits adjusted to frequency values corresponding to the difierent frequency values of said sources of signalling energy and said input circuits associated with the received sources of'high frequency energy respectively.

8. In a radio receiving system means for receiving a plurality of electromagnetic waves of high frequency signalling energy having different and harmonically related frequency values and different phase relations, a. plurality of thermionic tubes having input circuits the frequency characteristics of which correspond to the frequency values of said waves of energy respectively and a common output circuit associatedwith said thermionic tubes whereby the audio frequency components of said electromagnetic waves of energy are combined.

9. In a radio receiving system for receiving a plurality of waves of high frequency Sig nalling energy of different and harmonically related frequency values, the combination of a plurality of thermionic rectifying means having individual input circuits adjusted to different and harmonically related frequency values corresponding respectively to the frequency values of said waves, and a common output circuit associated with said thermionic tubes having substantially aperiodic frequency characteristics.

10. In a multiphase radio receiving system wherein a plurality of waves of high frequency signalling energy energize a plurality of thermionic tube amplifying means, a plurality of input circuits and output circuits associated with said amplifying means and each of said input and output circuits having frequency characteristics differing from and harmonically related to the other.

11. In a multiphase radio receiving system means for collecting a plurality of waves of high frequency signalling energy, said Waves having different and harmonically related frequency values, a plurality of thermionic tubes associated with input circuits having different and harmonically related frequency characteristics corresponding to the different and harmonically related waves of'signalling energy, a plurality of output circuits associated with said thermionic tubes and said output circuits connected in a delta arrangement.

12; In a multiphase high frequency receiving system the combination of a plurality of thermionic tubes associated with input circuits having different and harmonically related frequency characteristics, and a common output circuit associated with said thermionic tubes adapted to integrate the received high frequency energy.

13. In a multiphase radio receiving system the combination of means for collecting a plurality of waves of high frequency energy, said waves having different and harmonically related frequency values, a plurality of thermionic rectifying tubes associated with input circuits having frequency characteristics corresponding to the frequency values of said waves respectively, a common amplifying means associated with the output of said thermionic rectifying tubes and a common output circuit associated with said amplifying means.

14. In a multiphase high frequency receiving system the combination of means for collecting a plurality of waves of high frequency signalling energy, said waves having different harmonically related frequency values and different phase relations, a plurality of thermionic tubes having associated input circuits the frequency characteristics of which correspond respectively to the fre- T quency values of said waves of signalling energy and said thermionic tubes having a common output circuit for integrating the components of said waves of signalling energy.

15. A multiphase radio receiving system comprising in combination a plurality of thermionic tube rectifying means having input circuits of difierent and harmonieally related frequency characteristics and common I output circuit associated with said rectifying vidual amplifying means having frequency characteristics corresponding to said waves respectively.

17. A radio receiving system comprising in combination means for collecting a plurality of waves of multiphase high frequency signalling energy said waves having harmonically related and difi erent frequency values, a plurality of thermionic tube amplifying means having individual input circuits associated with said collecting means, and said amplifying means having a common output circuit for the integration of said waves of multiphase high frequency'signalling energy. I

18. A radio receiving system comprising in combination means for collecting a plurality of waves of signalling energy, said waves having unlike harmonically related frequency values and a difference of phase,-tl1ermionic tube amplifying means adapted to amplify said energy and said amplifying means having individualinput'circuits associated therewith and said input circuits having unlike harmonically related frequency characteristics corresponding respectively to the frequency valuesof said Waves of energy.

19. A. radio receiving system comprising in combination means for collecting a plurality of waves of high frequency energy, said waves having unlike harmonically re lated frequency values and having a predetermined difference in phase, a plurality of individual thermionic tube amplifying and rectifying means having unlike harmonically related frequency characteristics and said last mentioned means associated with said collecting means.

20. A system for thereception of a plu rality of waves of signal energy wherein said waves of energy, have unlilre harmonically related frequency values and a predetermined phase relation, a plurality of individual ther mionic vacuum tubes having individual input circuits, the frequency characteristics of which correspond to the frequencies of said waves respectively, and a delta connected output transformer associatedwithsaid tubes for the integration of said waves of signal energy.

LEO C. YOUNG. 

